# Justin

Newest questions and responses by Justin-
## Math

Write the power of 10 to multiply the divisor by to make it a whole number. Then, write the equivalent problem and find the quotient 16.65 ÷ 0.37

*asked on January 14, 2019* -
## chemistry

what is the characteristic wavelength of an electron (in nm) that has a velocity of 5.97 X 10^6 ms^-1 (me=9.11 X 10^-31kg)?

*asked on November 26, 2018* -
## Math

Dan has twice as many stickers as Cam does. If Dan gives Cam 15 of his stickers he will still have 22 more than Cam. How many stickers does each boy have?

*asked on November 19, 2018* -
## Chemistry

What sort of particles does iodine contain

*asked on October 12, 2018* -
## math

Rewrite the expression without using a negative exponent. -2m^-5 Simplify the answer as much as possible.

*asked on September 18, 2018* -
## Physics

A car travelling at 30m/s overcomes a frictional resistance of 100N while moving. Calculate the power developed by the engine.[1hp=0.75]

*asked on September 2, 2018* -
## social studies

How are the todays badlands different from the same area millions of years ago?

*asked on May 30, 2018* -
## math

if a lion spends about 5/6 of their day sleeping, how many hours does a lion sleep???

*asked on April 11, 2018* -
## Chemistry

A sample of a new plant food, "super gro", was analyzed. Determine the amount of grams of P and P2O5 as well as the percentage of P2O5 in a sample of "super gro". Mass of plant food sample: 12.50 grams Mass of MgNH4PO46H2O recovered: 8.93 grams

*asked on April 6, 2018* -
## Social studies

13. Why was Berlin airlift necessary when the Soviet Union isolated West Berlin A. East Berlin had no resources to help West Berlin B. The three nations that controlled West Berlin were not allies C. West Berlin had no access to a river D. West Berlin was

*asked on March 26, 2018* -
## social studies

Why are New York,Boston, and Philadelpia important cities

*asked on March 6, 2018* -
## Algebra 2 Sine Graphing

A sine function has the following key features: Period=4pi Amplitude: 2 Midline y=3 Y intercept; (0,3) The function is a reflection of its parent function over the x axis.

*asked on January 23, 2018* -
## Physics Prob.

A 22.0 kg child plays on a swing having support ropes that are 2.00 m long. A friend pulls her back until the ropes are 45.0 ∘ from the vertical and releases her from rest. What is the potential energy for the child just as she is released, compared with

*asked on November 24, 2017* -
## Economics

A perfectly competitive painted necktie industry has a large number of potential entrants. Each firm has an identical cost structure such that long-run average cost is minimized at an output of 20 units . The minimum average cost is $10 per unit. Total

*asked on November 5, 2017* -
## Economics

A perfectly competitive painted necktie industry has a large number of potential entrants. Each firm has an identical cost structure such that long-run average cost is minimized at an output of 20 units . The minimum average cost is $10 per unit. Total

*asked on November 5, 2017* -
## Biology

Plz i need help. Plants are green because the pigments in plants reflect green light. Blue and red light give them the most energy to power photosynthesis. You are conducting an experiment to see how different colors of light affect the growth of plants.

*asked on September 28, 2017* -
## Science

What is a factor that limits a technological design? A. a prototype B.a trade-off C.a constraint D.a patent

*asked on September 14, 2017* -
## Chemistry

When 20.0mL of 1.40M solution of calcium nitrate is mixed with 70.0mL of 0.234M potassium iodate, a precipitate Ca (IO3)2 is formed. Calculate the concentrations of both NO3- and IO3- before mixing and after mixing

*asked on July 6, 2017* -
## Chem

When 20.0mL of 1.40M solution of calcium nitrate is mixed with 70.0mL of 0.234M potassium iodate, a precipitate Ca (IO3)2 is formed. Calculate the concentrations of both NO3- and IO3- before mixing and after mixing.

*asked on July 6, 2017* -
## spanish 3

escribe la forma del verbo indicado en el tiempo indicado. yo / tener / future

*asked on May 26, 2017* -
## Math

The original price for a pair of sneakers was $70. John bought them on sale for 25% off. The sales tax was 6%. How much did John pay for the sneakers, including sales tax? A $16.80 B $18.55 C $52.50 D $55.65

*asked on May 22, 2017* -
## LANGUAGE ARTS

The topic is asking to research clothing in the Victorian period and then relate it to a Christmas carol and compare to today. Please help?

*asked on May 17, 2017* -
## Math

A typical around a track in the United States has a length of 440 yards. How many laps would need to be completed to run a mile

*asked on April 27, 2017* -
## Math

1. Graph the points A ( -5,0) B ( -4, 3) and C ( 0, -4) A B C D 2. Identify the quadrant in which (3, -6) lies A II B IV C I D III 3. Determine which ordered pair is a solution of y = 2x - 3 A ( -2, 7) B ( 0, 3) C ( -4, -11 D ( 5, -7 5. Graph the linear

*asked on March 23, 2017* -
## Science

How are earth and Venus similar? How is Venus different from Earth? Provide two similarities and two differences.

*asked on March 16, 2017* -
## Science

Explain what Maria and craters are and how they formed.

*asked on January 31, 2017* -
## Geometry

Which of the following represents a chord but not a diameter of the circle? A. TR B. SN C. PM D. SM

*asked on January 20, 2017* -
## Algebra

Barb is making a bead necklace. She strings 1 white bead, then 3 blue beads, then 1 white bead, and so on.Write the numbers for the first eight beads that are white.What is the rule for the pattern

*asked on January 5, 2017* -
## Geometry

A 20 meter long cable is used to support a telephone pole, holding it perpendicular to the ground. If the cable forms a 60 degree angle with the ground, how high up the pole should the cable be attached?

*asked on December 12, 2016* -
## Science

You are pushing a friend on a sled. You push with a force of 20N. Your friend and the sled together have a mass of 60kg. Ignoring friction, what is the acceleration of your friend on the sled?

*asked on December 12, 2016* -
## Calculus III

Hi, this question is about Langrange multipliers. Given f(x,y) = y^2 - x^2, subject to the constraint g(x,y) = 0.25x^2 + y^2 = 1, find the max and mins. So I found the partial derivatives for both f(x,y) and g(x,y): fx = -2x fy = 2y gx = 0.5x gy = 2y And

*asked on December 11, 2016* -
## Calculus III

Hi, this question is about Langrange multipliers. Given f(x,y) = y^2 - x^2, subject to the constraint g(x,y) = 0.25x^2 + y^2 = 1, find the max and mins. So I found the partial derivatives for both f(x,y) and g(x,y): fx = -2x fy = 2y gx = 0.5x gy = 2y And

*asked on December 10, 2016* -
## language arts

Could you check my answer please..thank you Which of the following sentences contain a linking verb? A. Teresa wore her favorite shoes today. B. Her shoes look really comfortable.xxx C. She put them on with striped socks. Teresa walked for hours without a

*asked on December 10, 2016* -
## language arts

Could you check my answer please..thank you Which of the following sentences contains a linking verb? A. Yesterday, Sarah experienced rock climbing for the first time.xxx B. Sarah seemed nervous at first. C. She climbed very well for a beginner. D. I think

*asked on December 10, 2016* -
## Calculus III

Hi, this question is about Langrange multipliers. Given f(x,y) = y^2 - x^2, subject to the constraint g(x,y) = 0.25x^2 + y^2 = 1, find the max and mins. So I found the partial derivatives for both f(x,y) and g(x,y): fx = -2x fy = 2y gx = 0.5x gy = 2y And

*asked on December 10, 2016* -
## Algebra

I need help understanding how to cross-multiply addition of inverse functions. I'm given this, 1/p+1/(p-45) = 1/30 The answer goes to p^2-105p+1,350 = 0. My method has been adjusting the ratios of the numerator and denominators to give,

*asked on December 6, 2016* -
## Ray Optics

Hi, this is about thin film interference in ray optics. My book presents two similar problems, but somehow uses different paths for the same variable. I'll list out the given variables: --Problem A-- n1 < nf > n2, delta phase is therefore lambda over two.

*asked on December 6, 2016* -
## General Physics II

Hi, this is about thin film interference in ray optics. My book presents two similar problems, but somehow uses different paths for the same variable. I'll list out the given variables: --Problem A-- n1 < nf > n2, delta phase is therefore lambda over two.

*asked on December 5, 2016* -
## 6th grade math

My question is: Between which two whole integers is -0.5. how do I explain this

*asked on December 5, 2016* -
## art

Could you please check my answer please...thank you Which of the following is the best evaluation of the artwork based on the criterion that the piece feature imaginary creatures or things. 1. The artwork is successful because it features a fully clothed

*asked on December 1, 2016* -
## math

how many sets of 4 are there in sets of 24?

*asked on November 30, 2016* -
## Math

Let (7,-3) be a point on the terminal side of theta. Find the exact values of sin of theta, csc of theta and cot of theta?

*asked on November 29, 2016* -
## Math

If one hundredths is divided into ten equal parts, each part is one (BLANK )

*asked on November 13, 2016* -
## pre algebra

2.5x10^-5 equals what?

*asked on November 7, 2016* -
## Math

n/-3 + 5 > 4= Have to explain all of the steps...every time I do it I come out with a different answer. Please I am totally lost on this one...Thank you.

*asked on November 2, 2016* -
## art

The math tessellations: unit 4 1. The architectural design was created by: 1. using an organic pattern in the form of tessellation. 2. using a geometric pattern in the form a tessellation. 3. using no definite pattern and placing shapes randomly. 4. using

*asked on October 21, 2016* -
## science

Which of the following can be used to explain why fossils of the same kinds of organisms can be found in different regions of the world? biogeography adaptation continental drift dispersal I think it is dispersal..but not sure..thank you for your help.

*asked on October 19, 2016* -
## Biology 20

I'm using chromatography to identify compounds in a leaf extract for a lab, and one of the evaluation questions is 'Suggest a step that could be added to the procedure to isolate a specific compound for chemical testing.' What step could I use?

*asked on October 6, 2016* -
## Organic Chemistry

Hi, I'm trying to fix an incorrect IUPAC name of a molecule. It is given as trisecbutylmethane, and I have to draw it out to correct it. Here's the thing: how do I draw incorrect IUPAC name? I can't wrap my mind around it. What I have drawn out is a

*asked on September 29, 2016* -
## Calculus III

Topic: Quadric surfaces. I have two homework problems, and they are quite a doozy for me. So the point is, I am given details of a quadric surface on the Cartesian coordinate system, and thus have to use the data to construct an equation through it.

*asked on September 18, 2016* -
## math

Shalina uses the expression 3x to determine the cost of x notebooks. What is the cost of 24 notebooks?

*asked on August 23, 2016* -
## General Physics

A 2.3 kg block is initially at rest on a horizontal frictionless surface when a horizontal force in the positive direction of an x axis is applied to the block. The force is given by F with arrow(x) = (2.6 − x^2) N, where x is in meters and the initial

*asked on July 16, 2016* -
## Physics

Five masses are positioned as follow in the x and y axis: m1 = 1 kg at (0,0) m2 = 2 kg at (4,0) m3 = 3 kg at (4,5) m4 = 4 kg at (0, 5) m5 = 5 kg at (2, 2) All x and y values are in meters. Find the magnitude and direction of the net gravitational force

*asked on July 14, 2016* -
## Physics

A 4.0-kg mass is placed at (3.0, 4.0) m, and a 6.0-kg mass is placed at (3.0, -4.0) m. What is the moment of inertia of this system of masses about the x-axis?

*asked on July 7, 2016* -
## General Physics

Clarification: this is calculus-based physics, so the methodology is not restricted to trigonometry only. I have two questions, so hopefully I can divide them up nice and evenly. Also, if you know where I should copy and paste proper vector notation from,

*asked on June 23, 2016* -
## World History

Who names himself dictator during the late Republic and early Empire?

*asked on May 19, 2016* -
## World History

How did the Punic Wars effect the Roman Army?

*asked on May 19, 2016* -
## World History

1. What island did Rome gain control of as a result of the first Punic War? A: Sicily B: Corsica C: Mediterranean D: None of the above

*asked on May 19, 2016* -
## Math

Find the first 4 terms in the expansion of ((3x^4)-(2/y^5))^9

*asked on May 13, 2016* -
## Science-Physics

As shown below, a 2.00 kg mass is connected to an unknown mass m via a massless rope and a massless, frictionless pulley. The mass m is on a ramp angled 20 degrees above the horizontal. The coefficients of kinetic and static friction are μk=0.35 and

*asked on May 13, 2016* -
## Pre Algebra (Math)

A certain animal can go for a long period of time without drinking water. When it does drink, its body weight can increase by 40%. Suppose the animal weighs 80 pounds after a long period without water. How many pounds can the animal gain when it drinks?

*asked on May 5, 2016* -
## Physics

A 4.00-kg block rests on a 30.0° incline. If the coefficient of static friction between the block and the incline is 0.700, what magnitude horizontal force F must act on the block to start it moving up the incline, given g= 9.80m/s^2?

*asked on May 5, 2016* -
## chemistry

If the water in 500mL of 0.44M NaCl solution is evaporated, what mass of NaCl will remain?

*asked on April 26, 2016* -
## Calculus II

So I'm trying to integrate a function using partial fractions. Here is the integral of interest: ∫(3x^2+5x+3)/[(x+2)(x^2+1)]dx. Since the numerator's degree of the polynomial is lesser than that of the denominator's degree, it is clear to separate.

*asked on April 25, 2016* -
## Calculus II

So I have Maclaurin series for sinx = ∑(-1)^n[x^(2n+1)]/(2n+1)!. I need to write out new series for sin(x^2). This will be equivalent to squaring the whole Maclaurin series of sinx, right? I'm just confused as to what terms are squared, and thus what the

*asked on April 25, 2016* -
## science

the solubility of an unknown substance is 120 grams of water at 70 degrees celsius. What is it?

*asked on April 20, 2016* -
## chemistry

What is the molarity of the following solutions? A. 0.96 g MgCl2 in 500 mL solution B. 9.33 g Na2S in 450 mL solution C. 2.48 g CaF2 in 375 mL solution

*asked on April 8, 2016* -
## chemistry

When 23g of C8H18 is combusted at STP, how many liters of carbon dioxide is produced?

*asked on April 4, 2016* -
## Science /bio

Any foods or fruits highest in glucose?

*asked on February 28, 2016* -
## Art

what idea did the halos on the heads of Pichore's main subjects emphasize A) plentiful wisdom •• B) Exceptional power C) Divine connection D) extraordinary creativity Correct me

*asked on February 19, 2016* -
## Chemistry

Okay so I understand this is incredibly unconventional, but I have a big favor to ask. I just got a chem exam back and my teacher still has not posted my scantron score. I was wondering if it is at all possible for you guys to just spot-check for accuracy.

*asked on February 17, 2016* -
## Math

Find two numbers which have a sum of 2 and a product of 2. This question is driving me crazy, please help!!

*asked on February 16, 2016* -
## math

In which quadrant does the angle Θ lie given that Cos Θ > 0 and tan Θ > 0? A. Quadrant I B. Quadrant II C. Quadrant III D. Quadrant IV B?

*asked on February 12, 2016* -
## Chemistry

A Sample of M2O3 weighing 11.205g is converted to 15.380g of MCL3, where M is the unknown metal, then what is the identity of M?

*asked on February 5, 2016* -
## math

If sierra swims laps every morning for week . she swims 4/5 of a mile every morning. how many miles does she swim in one week Do i multiply or divide 5/1 x 4/5. please help

*asked on February 4, 2016* -
## Math

A bag contains 3 blue marbles, 4 red marbles, and 2 white marbles. Three times you draw a marble and return it. Find the probability. P(all white)

*asked on February 1, 2016* -
## Computer Science

Create a class called Shapes that has a private int field named radius and the proper get- and set- methods (according to our Java coding standards). Create a constructor that takes an integer as a parameter to initialize the radius. Create a void method

*asked on January 29, 2016* -
## math

grantvilles governor receved 3 times as many votes as carys governor.carysgovernor received 790 votes. how many people voted altogether

*asked on January 14, 2016* -
## stat

While technology or a t-distribution Distribution Table can be used to find the area, in this problem, technology will be used. Find the P-value associated with t t0equals=1.34 and 19 degrees of freedom, rounding to three decimal places. Can

*asked on December 13, 2015* -
## Physics

A 50 gram mass vibrates in SHM at the end of a spring. The amplitude of the motion is 0.12 meters, and the period is T= 1.70 seconds. Find: The maximum acceleration of the mass? The speed of the mass when the displacement is 0.06 meters?

*asked on December 8, 2015* -
## Humanities

Having trouble answering these questions, about John Kani's film (Nothing but the Truth). 1. How does Mda see memory and identity as being linked? How is this reflected in Kani’s play? 2. How does the play mirror the intentions and role of the Truth and

*asked on December 7, 2015* -
## Physics

A steel bar has an initial length of 40 meters when the temperature is 20 oC. At what final temperature will the steel bar have a final length of 40.01 meters? The coefficient of linear expansion of steel is 12E-6 (1/C).

*asked on December 6, 2015* -
## Physics

A 35-g block of ice at -14°C is dropped into a calorimeter (of negligible heat capacity) containing 400 g of water at 0°C. When the system reaches equilibrium, how much ice is left in the calorimeter? The specific heat of ice is 2090 J(kg K) and the

*asked on December 5, 2015* -
## precalc

Solve: round to the thousandths if necessary! 1) 4^3/4x+5 = 12 2) log(x-1) + log x = log 6 3) 2log(base 4) 5 - log(base 4) x + log(base 4) 3 - log(base 4) 7 = 1/2

*asked on December 2, 2015* -
## Calculus

Use integration by parts to evaluate the definite integral. S 12 x/sqrt of x+4 dx 0

*asked on November 12, 2015* -
## physics

The potential energy of a pair of hydrogen atoms separated by a large distance x is given by U(x)=-C(subscript)6/x^6, where C_6 is a positive constant. What is the force that one atom exerts on the other? Is this force attractive or repulse? I've taken the

*asked on November 11, 2015* -
## Chemistry

Enthalpy I'm given that the heat of reaction for the combustion of ethane is -1560kJ/mol. I need to figure out how much heat is produced from 18g of ethane. 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O Okay so I'm rough on Thermo right now, so I gave it my best shot.

*asked on November 8, 2015* -
## Chemistry

Enthalpy I'm given that the heat of reaction for the combustion of ethane is -1560kJ/mol. I need to figure out how much heat is produced from 18g of ethane. 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O Okay so I'm rough on Thermo right now, so I gave it my best shot.

*asked on November 8, 2015* -
## Chemistry

Enthalpy I'm given that the heat of reaction for the combustion of ethane is -1560kJ/mol. I need to figure out how much heat is produced from 18g of ethane. 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O Okay so I'm rough on Thermo right now, so I gave it my best shot.

*asked on November 8, 2015* -
## Calculus 1

Locate the absolute extrema of the function f(x)=Sinpix on the closed interval [1,1/3]

*asked on November 5, 2015* -
## Calculus

Evaluate ∫ (cos(x))^(1/2)sin(x)dx Let u = cos(x)? ∫ (u)^(1/2)sin(x)dx = ∫ [2u^(3/2)/3]sin(x)dx ∫ [2cos(x)^(3/2)/3] (-cos(x)) dx? I thought this involved the FTC, but now I'm thinking that's false.

*asked on November 4, 2015* -
## Calculus

Alright, I want to see if I understand the language of these two problems and their solutions. It asks: If F(x) = [given integrand], find the derivative F'(x). So is F(x) just our function, and F'(x) our antiderivative? 1) F(x) = ∫(2, x)

*asked on November 4, 2015* -
## Calculus

Use a Riemann sum with n = 3 terms and the right endpoint rule to approx. ∫(1, 2) sin(1/x)dx. My teacher just needs the terms written out, no need to add or multiply. This is a problem she did up on the board, so here's her answer: sin(4/3)(1/3) +

*asked on November 4, 2015* -
## Calculus

Differentiate to find critical numbers and leave function in fully factored form. g(x) = (x^2+1)^5(x^2+2)^6 g'(x) = (x^2+1)^5[6(x^2+2)^5(2x)] + (x^2+2)^6[5(x^2+1)^4(2x)] g'(x) = 2x(x^2+1)^4(x^2+2)^5[6(x^2+2)(2x) + 5(x^2+1)(2x)] g'(x) =

*asked on October 15, 2015* -
## Math

My numerator is less than my denominator.I am more than 1/2. What fractions can Ibe

*asked on October 9, 2015* -
## Geometry

Point D is on the interior of angle ABC. Use the given information to find m angle DBC. (Draw the picture.) M angle ABC = (5x +6) M angle ABD = (7x - 9) M angle DBC = (5x - 6) Answer so far: (5x + 6) + (5x - 6) = (7x - 9) 10x = 7x - 9 10 x - 7x = -9 3x =

*asked on October 6, 2015* -
## Calc

An airplane is flying at a speed of 350 mi/h at an altitude of one mile and passes directly over a radar station at time t=0. a) Express the horizontal distance d (in miles) that the plane has flown as a function of t. I really don't know... would it be

*asked on October 5, 2015* -
## Calculus

Finding critical numbers g(theta) = 16(theta) - 4tan(theta) I can only get the derivative of g to be g'(theta) = 16 - 4sec^2(theta). Am I supposed to move on to get sec^2(theta) = 4, then sec(theta) = 2?

*asked on October 4, 2015* -
## Calculus

We are finding critical numbers f(x)= 8x^3+x^2+8x f'(x)=24x^2+2x+8 -> 2(12x^2+x+4) I'm honestly stuck. All I can tell is that I need to set my f'(x)=0, but I am lost there too. Quadratic form. equates to (-1±i√191)/24 I believe. That is as far as I can

*asked on October 4, 2015* -
## Calculus

We are finding critical numbers f(x)= 8x^3+x^2+8x f'(x)=24x^2+2x+8 -> 2(12x^2+x+4) I'm honestly stuck. All I can tell is that I need to set my f'(x)=0, but I am lost there too. Quadratic form. equates to (-1±i√191)/24 I believe. That is as far as I can

*asked on October 4, 2015*